diff --git a/src/p_mobj.c b/src/p_mobj.c
index b705772be..b29336cb1 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -8448,6 +8448,18 @@ static boolean P_MobjRegularThink(mobj_t *mobj)
 	}
 	case MT_BATTLEUFO:
 	{
+		if (battleovertime.enabled >= 10*TICRATE)
+		{
+			fixed_t distance = R_PointToDist2(mobj->x, mobj->y, battleovertime.x, battleovertime.y);
+
+			if (distance > battleovertime.radius)
+			{
+				// Delete emeralds to let them reappear
+				P_KillMobj(mobj, NULL, NULL, DMG_NORMAL);
+				return false;
+			}
+		}
+
 		Obj_BattleUFOThink(mobj);
 		break;
 	}